<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>游戏房间</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/game_room.css">
</head>
<body>
    <div class="nav">网络五子棋对战游戏</div>
    <div class="container">
        <div id="chess_area">
            <!-- 棋盘区域, 需要基于 canvas 进行实现 -->
            <canvas id="chess" width="450px" height="450px"></canvas>
            <!-- 显示区域 -->
            <div id="screen"> 等待玩家连接中... </div>
        </div>
        <div id="chat_area" width="400px" height="300px">
            <div id="chat_show">
                <p id="self_msg">你好！</p></br>
                <p id="peer_msg">你好！</p></br>
            </div>
            <div id="msg_show">
                <input type="text" id="chat_input">
                <button id="chat_button">发送</button>
            </div>
        </div>
    </div>
    <script>
        let chessBoard = [];
        let BOARD_ROW_AND_COL = 15;
        let chess = document.getElementById('chess');
        //获取chess控件区域2d画布
        let context = chess.getContext('2d');

        var ws_url = "ws://" + location.host + "/room";
        var ws_hdl = new WebSocket(ws_url);

        var room_info = null;//用于保存房间信息
        var is_me;

        function initGame() {
            initBoard();
            // 背景图片
            let logo = new Image();
            logo.src = "image/sky.jpeg";
            logo.onload = function () {
                // 绘制图片
                context.drawImage(logo, 0, 0, 450, 450);
                // 绘制棋盘
                drawChessBoard();
            }
        }
        function initBoard() {
            for (let i = 0; i < BOARD_ROW_AND_COL; i++) {
                chessBoard[i] = [];
                for (let j = 0; j < BOARD_ROW_AND_COL; j++) {
                    chessBoard[i][j] = 0;
                }
            }
        }
        // 绘制棋盘网格线
        function drawChessBoard() {
            context.strokeStyle = "#BFBFBF";
            for (let i = 0; i < BOARD_ROW_AND_COL; i++) {
                //横向的线条
                context.moveTo(15 + i * 30, 15);
                context.lineTo(15 + i * 30, 430); 
                context.stroke();
                //纵向的线条
                context.moveTo(15, 15 + i * 30);
                context.lineTo(435, 15 + i * 30); 
                context.stroke();
            }
        }
        //绘制棋子
        function oneStep(i, j, isWhite) {
            if (i < 0 || j < 0) return;
            context.beginPath();
            context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);
            context.closePath();
            //createLinearGradient() 方法创建放射状/圆形渐变对象
            var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);
            // 区分黑白子
            if (!isWhite) {
                gradient.addColorStop(0, "#0A0A0A");
                gradient.addColorStop(1, "#636766");
            } else {
                gradient.addColorStop(0, "#D1D1D1");
                gradient.addColorStop(1, "#F9F9F9");
            }
            context.fillStyle = gradient;
            context.fill();
        }
        //棋盘区域的点击事件
        chess.onclick = function (e) {
            if(!is_me){
                alert("等待对方走棋...");
                return;
            }
            let x = e.offsetX;
            let y = e.offsetY;
            // 注意, 横坐标是列, 纵坐标是行
            // 这里是为了让点击操作能够对应到网格线上
            let col = Math.floor(x / 30);
            let row = Math.floor(y / 30);
            if (chessBoard[row][col] != 0) {
                alert("当前位置已有棋子！");
                return;sss
            }
            //oneStep(col, row, true);
            //向服务器发送走棋请求，收到响应后，再绘制棋子
            send_chess(row,col);

        }
        function send_chess(r,c){
            var chess_info = {
                optype : "put_chess",
                room_id : room_info.room_id,
                uid : room_info.uid,
                row : r,
                col : c
            }
        ws_hdl.send(JSON.stringify(chess_info));
        console.log("点击：" + JSON.stringify(chess_info))
        }
    

        window.onbeforeunload = function(){
            ws_hdl.close();
        }
        ws_hdl.onopen = function() {
            console.log("房间长连接建立成功！");
        }
        ws_hdl.onclose = function() {
            console.log("房间长连接断开！");
        }
        ws_hdl.onerror = function() {
            console.log("房间长连接出错！");
        }
        function set_screen(me){
            var screen_div = document.getElementById("screen");
            if(me){
                screen_div.innerHTML = "轮到己方走棋..."
            }
            else{
                screen_div.innerHTML = "轮到对方走棋..."

            }
        
        
        }





        ws_hdl.onmessage = function(evt) {
            //1.在收到room_ready之后进行房间初始化
                //1.将房间信息保存起来
                var info = JSON.parse(evt.data);
                console.log(JSON.stringify(info));
                if(info.optype == "room_ready"){
                    //2.初始化显示信息
                    room_info = info;
                    is_me = room_info.uid == room_info.white_id ? true : false;
                    set_screen(is_me);
                    initGame();
                }
                else if(info.optype == "put_chess"){
                    console.log("put_chess" + evt.data);

                    if(info.result == false){
                        alert(info.reason);
                        return;
                    }
                    
                    //当前走棋用户id与自己用户id相同,则我走棋
                    is_me = info.uid == room_info.uid ? false : true;
                    //绘制棋子颜色
                    isWhite = info.uid == room_info.white_id ? true : false;

                    //绘制棋子
                    if(!info.row != -1 && !info.col != -1){
                        oneStep(info.col, info.row, isWhite);
                    
                        //设置棋盘信息
                        chessBoard[info.row][info.col] = 1;
                    }
                    //是否有胜利者
                    if(info.winner == 0)
                    {
                        return;
                    }
                    var screen_div = document.getElementById("screen");
                    if(room_info.uid == info.winner){
                        screen_div.innerHTML = info.reason;
                    }
                    else{
                        screen_div.innerHTML = "你输了！！！";
                    }
                    var chess_area_div = document.getElementById("chess_area");
                    var button_div = document.createElement("div");
                    button_div.innerHTML = "返回大厅";
                    button_div.onclick = function(){
                        ws_hdl.close();
                        location.replace("game_hall.html");
                    }
                    chess_area_div.appendChild(button_div);
                    //2.走棋操作
                        //1.获取下棋位置，判断当前下棋操作是否正常
                            //1.当前是否轮到自己走棋
                            //2.当前位置是否已经被占用
                        //2.向服务器发送走棋请求
                        //3.收到走棋消息，进行棋子绘制
                    //3.聊天动作





        }

                else if(info.optype == "chat"){
                    //收到一条消息，判断result，如果为true则渲染一条消息到显示框中
                    if(info.result == false){
                        alert(info.reason);
                        return;
                    }
                    var msg_div = document.createElement("p");
                    msg_div.innerHTML = info.message;
                    if(info.uid == room_info.uid){
                        msg_div.setAttribute("id","self_msg");
                    }
                    else{
                        msg_div.setAttribute("id","peer_msg");
                    }
                    var br_div = document.createElement("br");
                    var msg_show_div = document.getElementById("chat_show");
                    msg_show_div.appendChild(msg_div);
                    msg_show_div.appendChild(br_div);
                    document.getElementById("chat_input").value = "";

                }
                var cb_div = document.getElementById("chat_button");
                cb_div.onclick = function(){
                    var send_msg = {
                        optype : "chat",
                        room_id : room_info.room_id,
                        uid : room_info.uid,
                        message : document.getElementById("chat_input").value
                    };
                    ws_hdl.send(JSON.stringify(send_msg));
                }



    
}
    </script>
</body>
</html>